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final class Phantom[A](val s: String) extends AnyVal {
def compose(p: Phantom[A]): Phantom[A] = new Phantom[A](s+p.s)
}
object Test extends dotty.runtime.LegacyApp {
val x = new Phantom[Int]("foo")
val y = new Phantom[Int]("bar")
val z = x compose y
println(z.s)
}
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